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 MIL-HDBK-1013/1A
Table 20
Wall Construction Choices For New Construction
(Not More Than 12 Inches (305 mm) Thick)
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*
* Maximum Penetration Delay
*
*
*
*
Wall
Times (minutes)
*
*
*
Construction
Achievable
*
*
*
Type (b)
or Threat Severity Level
*
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*
*
Low * Medium
*
High *
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*
*
(a) *
* 18
*
Concrete Masonry Unit
5.5
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* Conventional Reinforced Concrete *
(a) *
* 35
*
7.5
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* Steel-Fiber-Reinforced Concrete *
(a) *
* 50
*
11.0
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(a) It is not practical for low level threats to attack walls.
Any construction can be considered adequate.
(b) Note: As described in what follows, different cross-section
thicknesses and rebar combinations apply to the low-,
medium-, and high-severity threat levels.
medium threat cross-hatched region in Figures 31, 33, and 34, the chart can
be used to establish the minimum penetration time. On the other hand, if the
delay time requirement is outside the medium-severity region, this means a
design having a thicker cross section and more rebar is required to preclude
only the practical use of hand- or battery-powered tools. In this case, pick
a cross section that is just outside the medium-severity region to stop the
threat. For example, if the delay requirement is 10 minutes for a medium-
severity threat against reinforced concrete (Figure 34), providing something
just over 6 inches of concrete will stop the threat.
1)
Medium-Severity Threat
a) Concrete Masonry Unit. As shown in Figure 31 and
Table 21, penetration delay times up to about 5.5 minutes are achievable
against medium-severity threats using mortar-filled CMU. Reinforcing bars in
the core are required for higher times. Figure 32 presents some additional
masonry/wood/metal composite cross-section design options together with their
penetration times.
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